US1075797A - Retaining-valve device. - Google Patents

Description

TTNTTE TATE ATENT FFT@EQ WALTER. V. TURNER, OE EDGEWOOD, PENNSYLVANIA, ASSIGNOR TO THE EVESTING- HOUSE AIR BRAKE COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

RETAINING-VALVE DEVICE.

To aZZ 'whom it may concern Be it known that I, lWALTER V. TURNER, a citizen of the United States, residing at Edgewood, in the county of Allegheny and State of Pennsylvania, have inventedV new and useful Improvements in Retaining- Valve Devices, ofewhich the following is a specification.

This invention relates to pressure retaining valves, and more particularly to. those employed in connection with fluid pressure brakes for retaining a certain degree of pressure in the brake cylinderl in releasing the brakes, so as to holdrthe bralres applied while the auxiliary reservoirs are being recharged. The degree of pressure at which the retaining valves are adjusted should be low enough to permit movement of the train by the engine with the brakes a Jplied at the adjusted pressure, but it is also desirable that the higher pressure existing in the brake cylinder at the time of releasing the bralres should not drop down too rapidly to the pressure of the retaining valve, in order to enable the auxiliary reservoirs to be substantially recharged before the minimum holding pressure is attained. This is particularly desirable in grade operation where the grade is heavy, as the higher braking pressure thus temporarily retained is of course more effective to hold the train in check. For the above reason, the retaining valve Outlet orifice for air released from the brake cylinder is usually of small size, and 011 this account is sometimes liable to become clogged with dirt or moisture.

The principal object of my invention is to provide a retaining valve device having a comparatively large outlet not liable to become clogged and means for restricting the rate of flow therethrough.

In the accompanying drawing; Figure 1 is a central sectional view of a pressure retaining valve device embodying my improvement, Fig. 2 a similar view, showing a slightly modified form of my improvement; and Fig. 3 an elevation of the pressure retaining valve device.

As shown in Fig. 1 of the drawing, a pressure retaning valve casing 1 is provided having a chamber 2 containing the usual weighted retaining valve 3. Fluid 'released from the brake cylinder is conveyed through pipe 4 from the triple valve exhaust port or Specfication of Letters Patent.

Application filed March 29, 1911.

Patented GetH 111,1913.

serial no. 817,785.

o otherwise to the passage 5 in Casing 1, and

the usual cock 6 is adapted to connect said passage either with an atmospheric eXhaust port 7 in one position or with a passage 8 which is Controlled by the weighted valve 3, in another position. According to my inv-ention, the outlet for fluid admitted to chamber 2, upon the lifting of the retaining valve from its seat, is provided with one or more chambers, such as the chambers 9 and j10, the Chamber 9 having communication with chamber 2 through a restricted passage ll'in plug 12, and communication from chamber 9 to chamber 10 is by way of a restricted passage 13 in a plug lt. A passage 15 in plug 16 forms communication from chamber 10 to the atmosphere. As the outlet from each of the chambers 2, 9, and 10 is restricted, it will be clear that the pressure in chamber 9 is less than that in chamber 2 and the pressure in chamber 10 is less than that in Chamber 9, consequently, by reason of the fact that the lower the pressure in a chamber, the less will be the rate of flow of air therefrom through an orifice of given size, the rate of flow from Chamber 10 to the atmosphere will be less than where the air escapes from chamber 2 directly through a single restricted orifice of the same given size.

It will now be evident that by means of my improvement the rate of flow from the retaining valve is restricted while yet employing Outlet passages of sulficient size to prevent clogging with dirt and the like,

If desired, the passages 11, 13, and 15 may extend straight through the plugs 12, 14, and 16 instead of being staggered, as shown in the drawing, although the latter arrangement is preferred, as the rate of flow of air is thereby reduced to some eXtent.

Any number of retarding chambers may be employed, according to the reduction 1n the rate of flow which is desired and the size of the restrictino orifice employed.

The construction hown in Fig. 2 is substantially the same as that shown n'Fig. 1, except that the retarding chamber device 1s arranged in the upper portion of the retaining valve casing.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A pressure retaining valve devlce comprising a casing, a retaining valve having an air Outlet, and a chamloer in said Outlet provided With a restricted inlet port and a restricted Outlet port.

2. A pressure retaining valve device comprising a casing, a retaining valve in said casing having an Outlet for the escape of fiuid, and a Chamber having a restricted inlet port and a restricted Outlet port for the passage of fluid escaping through said Outlet.

3. A pressure retaining valve device comprsing a casing, a retaining valve in said casing for holding a predetermined degree of pressure in the brake cylinder and having an Outlet for the escape of fluid past the retaining valve, and a chamher having a restricted inlet port and a restricted Outlet port for the passage of fluid escaping past said retaining valve.

4. A pressure retaining valve device comprising a casing, a loaded retaining valve in said casing for holding a predetermined degree of pressure in the brake cylinder and having an out-let for the escape of fluid, and a series of chambers in said Outlet having restricted inlet and Outlet ports for perniitting the escape of fluid from said retaining valve.

5. A pressure retaining valve device comprising a casing, a loaded retaining valve in said casing for holding a predetermined degree of pressure in the brake cylinder and having an Outlet for the escape of fluid, and one Or more chambers having staggered inlet and Outlet ports for permitting the escape of fiuid through said Outlet.

6. A pressure retaining valve device comprising a casing, a loaded retaining valve in said casing for holding a predetermined degree of pressure in the brake cylinder and having an Outlet for the escape of fluid, and a series of chambers in said Outlet, each provided With a restricted inlet port and a restricted Outlet port for the passage of fiuid escaping from the retaining valve.

In testmony Whereof I have hereunto set set my hand.

WALTER V. TURNER.

Witnesses:

A. M. CLEMENTS, '13. C. SWARTZWELDER.

Copies of this patent may be obtained for five cents each, by addressing' the Commissioner of Patents, Washington, D. 0.

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